CN101210662A - Planar light source apparatus, display apparatus and planar illumination method - Google Patents
Planar light source apparatus, display apparatus and planar illumination method Download PDFInfo
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- CN101210662A CN101210662A CNA2007103055735A CN200710305573A CN101210662A CN 101210662 A CN101210662 A CN 101210662A CN A2007103055735 A CNA2007103055735 A CN A2007103055735A CN 200710305573 A CN200710305573 A CN 200710305573A CN 101210662 A CN101210662 A CN 101210662A
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- light source
- array sheet
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/005—Arrays characterized by the distribution or form of lenses arranged along a single direction only, e.g. lenticular sheets
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/003—Lens or lenticular sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133611—Direct backlight including means for improving the brightness uniformity
Abstract
There is provided a planar light source apparatus, including: a light source configured to emit light in a spot-like pattern or a bar-like pattern; a reflective plate configured to reflect the light from said light source; a light guide plate disposed on the opposite side to said reflective plate with respect to the light source; and a lens array sheet disposed between the light source and the light guide plate; the lens array sheet having a plurality of convex-shaped lenses disposed in a predetermined state on a face thereof adjacent the light guide plate.
Description
Technical field
The present invention relates to a kind of planar light source device that is applicable to the display panels that for example throws light on, include the display unit of planar light source device and be used for the flat illumination method of planar light source device.
Background technology
As having this structure shown in Figure 20 and 21 at TV or the planar light source device that comprises the liquid crystal panel backlight that uses in the similar device of relative large scale screen.Notice that Figure 21 is the sectional view along the line II-II of Figure 20.With reference to Figure 20 and 21, shown planar light source device is so-called full run-down type, its be arranged on the display floater rear surface directly over.Especially, in the situation that forms by reflecting plate 10, a plurality of lamps 11 are set evenly.The front surface painted white of reflecting plate 10, thus usable reflection is from the light of lamp 11.For lamp 11, for example, can use CCFL pipe (cold-cathode fluorescence lamp).
Be provided with thereon on the reflecting plate 10 of lamp 11 diffuser plate 20 is set, thereby be directly incident on the light of diffuser plate 20 rear surfaces or by reflecting plate 10 reflections and incide of the front surface radiation of the light of diffuser plate 20 from diffuser plate 20 from lamp 11 1 sides.With rear surface from the optical illumination display panels of the surface emissivity of diffuser plate 20.Form diffuser plate 20 by mixed light diffusion material in transparent resin plate or by the front surface that the thin slice that will have the light diffusion adheres to diffuser plate 20, thereby with the brightness uniformity on the front surface of diffuser plate 20.Even for the brightness that makes display screen, the light emission state of control plane light supply apparatus is extremely important to obtain uniform brightness.
An example of the back lighting device of the above-mentioned type is disclosed among the Japanese laid-open patent No.Hei8-221013.
Summary of the invention
Carry one in passing, generally need reduce the thickness of whole liquid crystal display panel.Therefore, also need to form the full run-down type planar light source device that has with reference to the described structure of Figure 20 with less thickness.For the thickness of the full run-down type planar light source device that reduces structure shown in Figure 20, diffuser plate 20 is provided with near lamps 11.
Yet at formation level light supply apparatus like this, promptly in the situation of diffuser plate 20 near lamps 11 settings, only the mode by diffuser plate 20 is difficult to make fully the light diffusion.This just a problem occurred, and promptly the position directly over each lamp 11 becomes brighter, has destroyed uniformity of light in the light plane of departure.As the measure that overcomes this problem, advantage is taked following manner, promptly only uses light reflection element to reduce light directly over the lamp in the position of the diffuser plate directly over each lamp.Yet this another problem occurred, i.e. the brightness of overall region descends, and does not therefore often take above-mentioned this measure.
Therefore, need provide a kind of planar light source device, display unit peace planar illumination method, can realize that wherein thickness reduces to launch with light the homogenising of brightness.
According to embodiment of the present invention, a kind of planar light source device is provided, it comprises: light source, it is configured to launch light, reflecting plate with dot pattern or bar graph case, it is configured to reflect light, optical plate from described light source, with respect to described light source, this optical plate is arranged on the opposite side of described reflecting plate and lens array sheet, it is arranged between described light source and the described optical plate, described lens array sheet has a plurality of convexs that are provided with predetermined state on the close surface of described optical plate lens.
In this planar light source device, the lens of the convex of scioptics array chip spread the light from light source with the effect that is arranged on the optical plate on the lens array sheet.Thereby, can advantageously spread also radiation from the light of light source from optical plate.Therefore, even reduced distance, also can obtain the similar light diffusion property of light diffusion property that is obtained with existing planar light source device from the reflecting plate that wherein holds light source to optical plate.Thereby, can reduce the thickness of light supply apparatus and the thickness of the display unit of this light supply apparatus wherein is housed.
When in conjunction with the accompanying drawings, above the present invention and other feature and advantage will become apparent from following description and appended claim, wherein identical reference marker is represented identical parts or element.
Description of drawings
Fig. 1 is the perspective view of an example that is used for the general structure of planar light source device of the present invention;
Fig. 2 is the sectional view along the line I-I of Fig. 1;
Fig. 3 is the decomposition diagram of the amplification of a planar light source device part;
Fig. 4 is the schematic diagram of the light-path of general display plane light supply apparatus;
Fig. 5 is the schematic diagram of an example of path that incides the light of lens array sheet in the display plane light supply apparatus with 0 ° of angle;
Fig. 6 is the schematic diagram that shows the part of Fig. 5 with the ratio of amplifying;
Fig. 7 is the schematic diagram of an example of path that incides the light of lens array sheet in the display plane light supply apparatus with 10 ° of angles;
Fig. 8 is the schematic diagram that shows the part of Fig. 7 with the ratio of amplifying;
Fig. 9 is the schematic diagram of an example of path that incides the light of lens array sheet in the display plane light supply apparatus with 20 ° of angles;
Figure 10 is the schematic diagram that shows the part of Fig. 9 with the ratio of amplifying;
Figure 11 is the schematic diagram of an example of path that incides the light of lens array sheet in the display plane light supply apparatus with 45;
Figure 12 is the schematic diagram that shows the part of Figure 11 with the ratio of amplifying;
Figure 13 is the chart attirbutes of an example of the Luminance Distribution of diagrammatic plan light supply apparatus;
Figure 14 is the partial cross section figure that is used for another planar light source device of the present invention, and it has shown wherein an example of the structure that the surface to optical plate processes;
Figure 15 is the partial cross section figure that is used for another planar light source device of the present invention, and it has shown a wherein example of the structure of the inhomogeneous setting of lens projection;
Figure 16 is the perspective view that is used for another planar light source device of the present invention, and it has shown an example of the structure of wherein using spot light;
Figure 17 is the decomposition diagram of light supply apparatus shown in Figure 16;
Figure 18 is the perspective view that is used for another planar light source device of the present invention, and it has shown an example of the structure of wherein using round lens;
Figure 19 is the perspective view that is used for another planar light source device of the present invention, and it has shown another example of the structure of wherein using round lens;
Figure 20 is the perspective view of an example of the structure of conventional full run-down type planar light source device;
Figure 21 is the sectional view along the line II-II of Figure 20.
The specific embodiment
With reference to Fig. 1 and 2, shown to be used for planar light source device 100 of the present invention.Planar light source device 100 comprises and is arranged on the reflecting plate 110 on the bottom and is set in parallel in a plurality of (demonstration for arranging five) bar-shaped lamp 101,102,103,104 and 105 on the flat surfaces 111 of reflecting plate 110.Should be noted that shown in arrangement in, although use CCFL pipe (cold-cathode fluorescence lamp) as lamp 101 to 105, the lamp that is used for lamp 101 to 105 is not limited to CCFL and manages, and for example can be thermionic-cathode tube.
The inner surface painted white of reflecting plate 110, thus usable reflection is from the light of lamp 101 to 105.Reflecting plate 110 has pair of angled portion 112 in its relative end, thereby the upper end 113 of rake 112 contacts with lens array sheet 120.Be shown as opening although should be noted that the opposed end of the reflecting plate 110 on lamp 101 to 105 longitudinal directions among Fig. 1, thereby can see internal structure, in fact they also are coated with some elements.Reflecting plate 110 is for example formed foam phthalic acid glycol ester by poly-.
Be arranged on the flat surfaces 124 (rear surfaces that lens array sheet 120 on the reflecting plate 110 has close reflecting plate 110 (on the downside in Fig. 1); With reference to Fig. 3), and have a plurality of lens projectioies 121 that are arranged on its front surface, each lens projection all is used as convex lens.In addition, optical plate 130 is set on the front surface of lens array sheet 120.Optical plate 130 is by having uniform thickness and having flat front and the transparent element of rear surface forms.In Fig. 2, the display floater 190 that is arranged on optical plate 130 front surfaces is illustrated by the broken lines.Like this, the rear surface of display floater 190 is by the optical illumination from optical plate 130 front surfaces, thereby carries out the operation to the image illumination that shows on display floater 190.Display floater 190 is for example formed by display panels.
Fig. 3 is the exploded view of the amplification of lens array sheet 120 and optical plate 130.With reference to Fig. 3, each the lens projection 121 that is arranged on the lens array sheet 120 forms linear fin, and its lobed cross section is as the cross section of general triangular.Lens projection 121 is provided with so continuously, and promptly they extend parallel to each other.
Each lens projection 121 has curved surface portion 122 at its opposite side, and its top between curved surface portion 122 has first surface portion 123.Curved surface portion 122 has the parabolic curved surface, thereby focuses near the flat surfaces portion 123 focal position F (Fig. 4) from the light of parabolic curved surface reflection.Yet it should be noted that, the shape of cross section of curved surface portion 122 needn't have parabolic shape completely, but can have other different shapes, as be similar to parabolical curved shape, curved shape, the pure elliptical shape of representing by hyperbola and the shape of forming by straight line and curve.When using the parabolic curved surface, determined the focal position of light.Yet,, can not provide focus according to shape.
The flat surfaces portion 123 of the lens projection 121 of lens array sheet 120 and the rear surface of optical plate 130 closely optics contact.Although lens array sheet 120 and optical plate 130 can closely keep each other by any way, for example can use translucent adhesive or ultraviolet curable resin material.Yet, no matter use what mode, importantly lens array sheet 120 and optical plate 130 each other closely optics contact.
With reference to Fig. 4, when the spread length (spacing) of lens projection 121 is represented by W1, when the width of the flat surfaces portion 123 at place, lens projection 121 tops was represented by W2, distance W 1 for example was arranged to about 0.2 to 0.3mm, and width W 2 for example is arranged to about 0.005 to 0.02mm.For the sake of clarity, use the lens projection 121 that has shown the lens array sheet 120 shown in the figure than the big size of the above size that provides.The spread length that should be noted that lamp 101 to 105 for example is approximately 20 to 30mm.Preferably, the focal position F (Fig. 4) that is formed by parabolic curved surface element 122 is being in the distance of [distance W 1 * 0.1] from flat surfaces portion 123.Be flattened away from its rear surface 124 of lens array sheet 120 that is provided with the upper surface of lens projection 121.
Now, describe from the path profile of the light of rear surface (lower surface) the side incident of the lens array sheet 120 of structure in the above described manner with reference to Fig. 4.Arrive the lens surface of lens arra with higher ratio from the emission of any lamp and the light A that impinges perpendicularly on lens array sheet 120.Therefore, because reflection of light has appearred in the refractive index difference between air and the lens arra material.The focal position F of the reverberation scioptics projection 121 of light A also arrives the upper surface 132 of optical plate 130.Here, if the angle of light suitably is set, then light is by upper surface 132 total reflections of optical plate 130.By the light of upper surface 132 reflection of optical plate 130 also by lower surface 131 total reflections, because the upper surface 132 of optical plate 130 and lower surface 131 extend parallel to each other.As a result, light is propagated in optical plate 130.Because the optical interaction on bonding plane, optical plate 130 and the lens arra surface etc. of light and lens array sheet 120, the light of propagating in optical plate 130 is radiated optical plate 130 outsides in the position of total reflection condition forfeiture.When the light that is radiated optical plate 130 outsides during from upper surface 132 outgoing of optical plate 130, it becomes the illumination light of illumination display floater.Yet some light are from lower surface 131 outgoing of optical plate 130.Be radiated reflecting plate 110 sides from the light scioptics array chip 120 of lower surface 131 outgoing of optical plate 130, and plate 110 reflections that are reflected, thereby it is introduced in the lens array sheet 120.Thereby finally all light is from upper surface 132 outgoing of optical plate 130.
Should be noted that the incidence angle at light and upper surface 132 or lower surface 131 is equal to or less than in the situation of some specific angle (for example being equal to or less than 43 °), light is by the upper surface 132 of optical plate 130 and lower surface 131 reflections.Yet in described angle was less than or equal to 90 ° situation greater than specific angle, light can outgoing, and is not reflected.The special angle that is used to reflect depends on the material of optical plate 130.Simultaneously, the end surfaces 133 (Fig. 1) of optical plate 130 process is handled, thereby no matter incident light is all reflected in incidence angle incident, thereby can stop light to be radiated outside from end surfaces 133.
Because lens array sheet 120 is with above-mentioned this mode effect, thus according to the structure of the present embodiment, from lamp to directly over the part light of emission optical plate 130, propagate, thereby from the diverse location radiation of optical plate 130.Average distance and the ratio of the light component of from the light that impinges perpendicularly on optical plate 130 in the deriving size and the lamp bank row that depend on the intrinsic part of planar light source device 100 of light in optical plate 130.Therefore, suitably check the given shape of lens projection 121, the flat surfaces portion 123 of lens projection 121 and the bonding region between the optical plate 130 etc.
On the other hand, if arrive the surface of the lens projection 121 of lens array sheet 120 from the ramp-launched smooth B of lamp, then according to the position of incidence angle, lens etc., light can deflect into all directions.As a result, optical plate 130 is used for diffusion from the ramp-launched light of lamp.
Shown among Fig. 5 to 12 that wherein light is with the simulation example of the state of the bond pad of all angles introducing lens array sheet 120 and optical plate 130.Should be noted that the angle shown in Fig. 5 to 12 is expressed as and differential seat angle by the determined 0 ° of angle of light of the lens array sheet 120 that impinges perpendicularly on flat type.In addition, the incident light shown in the figure (described afterwards L0, L10, L20 and L45) is the light with the width incident of the spacing of a lens projection 121.
Fig. 5 illustrates the reflective condition that incides the light L0 of lens array sheet 120 with 0 ° of angle.Fig. 6 has shown the middle part of Fig. 5 with the ratio of amplifying.As the propagation that goes ahead of the light of seeing, go ahead the flat surfaces portion 123 that propagates into lens projection 121 from Fig. 5 and 6, also be so and from upper surface 132 outgoing of optical plate 130 in optical plate 130.Simultaneously, the part light that incides the curved surface portion 122 of lens projection 121 is bent surface element 122 reflections and near focal position (or focus) is laggard goes into optical plate 130 passing.
Fig. 7 and illustrate the reflective condition that incides the light L10 of lens array sheet 120 with 10 ° of angles as Fig. 8 of Fig. 7 enlarged drawing.Fig. 9 and illustrate the reflective condition that incides the light L20 of lens array sheet 120 with 20 ° of angles as Figure 10 of Fig. 9 enlarged drawing.Figure 11 and illustrate the reflective condition that incides the light L45 of lens array sheet 120 with 45 as Figure 12 of Figure 11 enlarged drawing.From above-mentioned accompanying drawing as can be seen, along with incidence angle increases, reflective condition so changes, and promptly the light from upper surface 132 radiation of optical plate 130 increases.
Because the combination of lens array sheet 120 and optical plate 130 is by this way as diffuser plate, so relaxed the brightness of bright portion directly over the lamp.Therefore, even reduce from reflecting plate 110 to optical plate 130 thickness, also can obtain and the similar Luminance Distribution of existing planar light source device from existing planar light source device.
Figure 13 illustrates relative brightness with the planar light source device of existing structure shown in Figure 20 and distributes and compare, and the relative brightness of the planar light source device 100 that produces with the structure according to the present embodiment distributes.The curve of being represented by the dotted line among Figure 13 is represented the Luminance Distribution of the planar light source device of existing structure.The Luminance Distribution of the existing structure that is illustrated by the broken lines shows the variation that disappears very much, and it roughly is uniform.If form the planar light source device of existing structure with less thickness when keeping this structure, then the brightness meeting shows bigger variation according to the position, sees as the dotted line from Figure 13 (dotted line that length replaces).Therefore, the planar light source device with existing structure of less thickness is not suitable for the backlight of display floater.
Here, if planar light source forms with the less thickness that is similar to following planar light source, the i.e. brightness of this planar light source is illustrated by the broken lines and makes up lens array sheet 120 and the optical plate 130 that has according to the structure of above-mentioned embodiment, in the Luminance Distribution that can obtain to be represented by the solid line among Figure 13.The Luminance Distribution of being represented by solid line roughly is equivalent to the Luminance Distribution of the existing planar light source device that thickness in the above described manner do not reduce.Thereby this Luminance Distribution demonstrates the superperformance that is applicable to that display floater is backlight.Therefore, even, also can obtain to be similar to the Luminance Distribution of existing planar light source from having the thickness that planar light source reduces planar light source now.
It should be noted that, although in the above-described embodiment, optical plate 130 forms smooth transparent panel, and it also can form the element with light diffusion function, perhaps for example on the surface of optical plate 130 ', form diffusion function portion 134, as seeing among Figure 14.Lower surface 131 is left the form of flat surfaces.Diffusion function portion 134 for example can form by forming very little jog from the teeth outwards.Perhaps, optical plate 130 itself does not have diffusion function, but selectively, the independent resin sheet that will have diffusion function adheres to the surface of optical plate 130.
In addition, although in the above-described embodiment, the lens projection 121 on the lens array sheet 120 is provided with continuously, very close to each other between them on the lens array sheet 120, as seeing among Fig. 3, also can have the gap between them they are set.In addition, can come some difference to be set according to the position to these gaps.
Figure 15 has shown above-mentioned structure with cross section.With reference to Figure 15, shown in lens arra 120 ' in, position directly over lamp 101 to 104, lens projection 121 is provided with continuously, between them, do not have the gap, but lens projection 121 so is provided with, and promptly the distance along with position directly over each lamp increases, and the spread length between the lens projection increases.This of scioptics projection 121 is provided with, the position directly over each lamp, the diffusion function of lens projection 121 is stronger, but in the position of leaving position directly over each lamp, diffusion function a little less than.Thereby lens projection 121 is very big for the uniformity contribution of Luminance Distribution.
In addition, although in the above-described embodiment, use as light source, is selectively used difform light source with the radiative CCFL pipe of bar-shaped distribution.For example, even in the situation of bar-shaped light source, can use the fluorescent lamp of U-shaped bending.Perhaps, can use from being similar to the radiative point source of light in position a little, as light emitting diode (LED).Here using point source of light and bar-shaped light source to form contrast, is not to give directions light source.
Adopting point source of light, in the situation as light emitting diode, the shape and the ordered state that preferably are arranged on the lens projection on the lens array sheet are arranged to be applicable to point source of light.
Figure 16 and 17 has shown the device that wherein uses light emitting diode to show Figure 16 in the mode of amplifying as example, especially Figure 17 of the planar light source device of light source.With reference to Figure 16 and 17, shown in planar light source device in, the diverse location place on reflecting plate 110 is provided with each four light source 211 that all formed by light emitting diode.Lens array sheet 220 so forms, and the position of promptly a plurality of continuous round lens projectioies 221 on directly over each light source 211 is provided with one heart.Lens projection 221 has the cross section of the lens projection 121 of the lens array sheet 120 that is similar to shown in Fig. 4, promptly has curved surface portion 122 and smooth surface element 123.Be arranged on optical plate 130 on the lens array sheet 220 and have the structure identical with above-mentioned optical plate 130.
In planar light source device has situation with reference to Figure 16 and 17 described structures, stronger light diffusion takes place in the position near position directly over each light source 211, thereby can be advantageously with illuminance distributionization from the light of optical plate 130 emissions.Therefore, can reduce to use point source of light, as the thickness of the planar light source device of light emitting diode.In the arrangement of this external Figure 16, provide the distance of the arrangement of round lens projection 221, it is along with the distance from each light source increases and increases.In addition,, lens projection 221 is not set, can on the whole surface of lens array sheet 220, round lens projection 221 be set yet in position away from light source 211 although in the arrangement of Figure 16.Yet, on whole surface, being provided with in the situation of lens projection 221, the lens projection 221 at outer part place does not have annular shape.
In addition, a plurality of lens projectioies that are arranged on the lens array sheet have the convex of circular cone.
Figure 18 has shown an example of the structure in this situation.In addition, in the example of Figure 18, the diverse location place on reflecting plate 110 is provided with each four light source 211 that all formed by light emitting diode.Lens array sheet 320 so is provided with, and promptly Conical Lenses projection 321 is provided with on vertical and horizontal continuously in the mode of matrix.Lens projection 321 has the cross sectional shape identical with the lens of lens array sheet shown in Fig. 4 120 projection 121, promptly has the shape of curved surface portion 122 and smooth surface element 123.Should be noted that because lens projection 321 has cone shape, so no matter get the cross section on what direction, all show identical shape of cross section, have annular shape corresponding to the surface of curved surface portion 122, flat surfaces portion 123 has round-shaped.Be arranged on optical plate 130 on the lens array sheet 220 and have the structure identical with above-mentioned optical plate 130.
In this external situation of taking with reference to the described structure of Figure 18, but the effective diffusion into the light emitted of effect of scioptics array chip 320 and optical plate 130 can reduce the thickness of planar light source device.
It should be noted that, in the situation of taking wherein to be provided with the structure shown in Figure 18 of lens projection 321, position directly over light source 211, lens projection 321 can be provided with continuously, between them, do not have the gap, and in the position of leaving above-mentioned position, lens projection 321 is with the setting that concerns of some distances that are spaced apart from each other.
Figure 19 has shown an example of the structure in this situation.With reference to Figure 19, shown on the lens array sheet 320 ' in the planar light source device, the lens projection 321 of cone shape so is provided with, i.e. position directly over 211, lens projection 321 is provided with continuously, does not have the gap between them.Yet, in the position of leaving position directly over the light source 211, the concern setting of lens projection 321 to be spaced apart from each other.Concrete by the arrangement that changes lens projection 321, as shown in Figure 19, can be further with the disperse state homogenising of light.
Although the preferred embodiment of the invention of using particular term to describe, this description only are the purposes of explaining, should be appreciated that not breaking away under the situation of the spirit or scope of claim subsequently, can change and change.
The cross reference of related application
The present invention comprises the relevant theme of submitting in Japan Patent office with on December 27th, 2006 of Japanese patent application JP2006-352605, and the combination here of its full content as a reference.
Claims (10)
1. planar light source device, it comprises:
Light source, it is configured to dot pattern or bar graph case emission light;
Reflecting plate, it is configured to reflect the light from described light source;
Optical plate, this optical plate are arranged on the opposite side with respect to described light source of described reflecting plate; With
Lens array sheet, it is arranged between described light source and the described optical plate;
Described lens array sheet has a plurality of convexs that are provided with predetermined state on the close surface of described optical plate lens.
2. planar light source device according to claim 1, wherein, the lens of the described convex of described lens array sheet have the roughly cross section of parabolic shape, and it has the focal position near described lens array sheet and described optical plate position contacting.
3. planar light source device according to claim 1, wherein, the lens of the described convex on the described lens array sheet have the flat surfaces portion that contacts with described optical plate at its place, summit.
4. planar light source device according to claim 1, wherein, described light source forms formation with the radiative light source of bar graph case, and the lobed shape of cross section of the lens of the described convex on the described lens array sheet, and is roughly parallel to linear extension of ordered state of described light source.
5. planar light source device according to claim 1, wherein, described light source forms and is configured to the radiative light source of dot pattern, and the lobed cross section of the lens of the described convex on the described lens array sheet, and roughly is provided with one heart around the position that is provided with of described point source of light.
6. planar light source device according to claim 1, wherein, the lens of the described convex on the described lens array sheet have circular convex respectively, and are arranged on two-dimensionally on the described lens array sheet with predetermined each other spaced relationship.
7. planar light source device according to claim 1, wherein, the lens of the described convex on the described lens array sheet so are provided with, and promptly along with the distance that the position is set apart from described light source increases, the spread length between the lens of convex increases.
8. planar light source device according to claim 1 wherein, further comprises:
Light diffusion element, it is arranged on the surface of described optical plate.
9. display unit comprises:
Display floater; With
Be arranged on the planar light source portion on the described display floater rear surface;
Described planar light source portion comprises:
Light source, it is configured to dot pattern or bar graph case emission light;
Reflecting plate, it is configured to towards the light of the rear surface of described display floater reflection from described light source,
Optical plate, this optical plate be arranged on described reflecting plate with respect on the described light source opposite side and
Lens array sheet, it is arranged between described light source and the described optical plate,
Described lens array sheet has a plurality of convexs that are provided with predetermined state on the close surface of described optical plate lens.
10. flat illumination method of throwing light in planar mode, it comprises the steps:
To introduce the rear surface of lens array sheet from the light of light source, described light source is launched light with dot pattern or planar mode, and described lens array sheet has the lens of a plurality of convexs that are provided with predetermined state in its surface;
To introduce optical plate from the light of the surperficial outgoing of described lens array sheet; With
Carry out flat illumination with light from the optical plate outgoing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP352605/06 | 2006-12-27 | ||
| JP2006352605A JP4274239B2 (en) | 2006-12-27 | 2006-12-27 | Planar light source device, display device, and planar illumination method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101210662A true CN101210662A (en) | 2008-07-02 |
| CN100587323C CN100587323C (en) | 2010-02-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710305573A Expired - Fee Related CN100587323C (en) | 2006-12-27 | 2007-12-27 | Planar light source apparatus, display apparatus and planar illumination method |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US7794100B2 (en) |
| JP (1) | JP4274239B2 (en) |
| KR (1) | KR20080061287A (en) |
| CN (1) | CN100587323C (en) |
| TW (1) | TW200835977A (en) |
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| CN101956913A (en) * | 2009-07-16 | 2011-01-26 | 三星电子株式会社 | Backlight assembly |
| CN102612661A (en) * | 2009-12-28 | 2012-07-25 | 第一毛织株式会社 | Pattern light guide plate, method for manufacturing same, and backlight unit of a liquid crystal display using same |
| US9316363B2 (en) | 2010-11-12 | 2016-04-19 | Lg Innotek Co., Ltd. | Lighting device |
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- 2006-12-27 JP JP2006352605A patent/JP4274239B2/en not_active Expired - Fee Related
-
2007
- 2007-12-17 TW TW096148284A patent/TW200835977A/en unknown
- 2007-12-20 KR KR1020070134013A patent/KR20080061287A/en not_active Application Discontinuation
- 2007-12-26 US US12/005,247 patent/US7794100B2/en not_active Expired - Fee Related
- 2007-12-27 CN CN200710305573A patent/CN100587323C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956913A (en) * | 2009-07-16 | 2011-01-26 | 三星电子株式会社 | Backlight assembly |
| US8786802B2 (en) | 2009-07-16 | 2014-07-22 | Samsung Display Co., Ltd. | Backlight assembly and display apparatus having the same |
| CN102612661A (en) * | 2009-12-28 | 2012-07-25 | 第一毛织株式会社 | Pattern light guide plate, method for manufacturing same, and backlight unit of a liquid crystal display using same |
| US9316363B2 (en) | 2010-11-12 | 2016-04-19 | Lg Innotek Co., Ltd. | Lighting device |
| US10088115B2 (en) | 2010-11-12 | 2018-10-02 | Lg Innotek Co., Ltd. | Lighting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008166057A (en) | 2008-07-17 |
| TW200835977A (en) | 2008-09-01 |
| JP4274239B2 (en) | 2009-06-03 |
| CN100587323C (en) | 2010-02-03 |
| US20080158880A1 (en) | 2008-07-03 |
| US7794100B2 (en) | 2010-09-14 |
| KR20080061287A (en) | 2008-07-02 |
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